The book was released as an activist tool of The Global Population Speak Out, an organization that unites environmentalists. If you aren't convinced that our planet is overpopulated, these 10 images and short quotes from the book are all the proof you need.

"Speak Out works to equip those already engaged in addressing environmental concerns with strong materials and messages to help them raise awareness and catalyze change," explains Joe Bish, the director of Issues Advocacy at Population Media Center, in the Speak Out's press release. "We are really looking forward to crowd-sourced, creative ideas for how to put this amazing book to work as an agent of positive change."